Patterns of follicular development during periods of anovulation in pasture-fed dairy cows after calving

The ovaries of 17 Friesian cows aged two to seven years were examined daily by transrectal ultrasound from one week after calving. The position and size of all follicles more than 2 mm in diameter were recorded. A large (more than 9 mm in diameter) follicle was present on at least one ovary by six t...

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Bibliographic Details
Published in:Research in veterinary science 1995-05, Vol.58 (3), p.212-216
Main Authors: McDougall, S, Burke, C.R, Macmillan, K.L, Williamson, N.B
Format: Article
Language:English
Subjects:
Animal Feed
Animals
Anovulation - veterinary
Cattle - physiology
Dairying
Female
Ovum - diagnostic imaging
Ovum - growth & development
Postpartum Period - physiology
Ultrasonography
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Summary:The ovaries of 17 Friesian cows aged two to seven years were examined daily by transrectal ultrasound from one week after calving. The position and size of all follicles more than 2 mm in diameter were recorded. A large (more than 9 mm in diameter) follicle was present on at least one ovary by six to 17 days after calving, and in two of the cows it ovulated; the remaining cows had from two to nine large follicles before they ovulated. The mean ( sem) interval from calving to the first ovulation was 43 ·4 (5·3) (range 13 to 93) days, after 4·2 (0·6) waves of follicles.
ISSN:0034-5288
1532-2661
DOI:10.1016/0034-5288(95)90104-3